var makeSignature = function (time, url) {
    var signature = null;
    $.ajax({
        url: "/vv/wx/signature",
        method: 'get',
        data:{
            timestamp:time,
            nonceStr: 'vv',
            url:url,
        },
        async:false,
        success: function(data){
            signature = data;
        }
    });

    return signature;
}



